Answer
Some artesian wells do not flow at Earth's surface because the pressure surface is below the ground level. In such cases, the water is still under pressure in the aquifer, but not enough to push it to the surface. When the pressure surface is at or above the ground level, the well becomes a flowing artesian well, and water will rise naturally without any pumping. The elevation of the pressure surface is crucial in determining whether an artesian well will flow or not. If the pressure surface is below the ground level, the well would be non-flowing, and pumping would be necessary to bring the water to the surface.
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